diff options
author | Daniel Lezcano <daniel.lezcano@linaro.org> | 2016-06-06 20:11:12 +0300 |
---|---|---|
committer | Daniel Lezcano <daniel.lezcano@linaro.org> | 2016-06-28 11:19:29 +0300 |
commit | adbaf5254152f322b873d0a9cd0f150dd30c64aa (patch) | |
tree | c9e563a6d9ac86242d1ad246b592fecb78e03c93 /drivers/clocksource/timer-atmel-st.c | |
parent | 504f34c9e45cf81731734ea1c80429a5116b23ca (diff) | |
download | linux-adbaf5254152f322b873d0a9cd0f150dd30c64aa.tar.xz |
clocksource/drivers/atmel-st: Convert init function to return error
The init functions do not return any error. They behave as the following:
- panic, thus leading to a kernel crash while another timer may work and
make the system boot up correctly
or
- print an error and let the caller unaware if the state of the system
Change that by converting the init functions to return an error conforming
to the CLOCKSOURCE_OF_RET prototype.
Proper error handling (rollback, errno value) will be changed later case
by case, thus this change just return back an error or success in the init
function.
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'drivers/clocksource/timer-atmel-st.c')
-rw-r--r-- | drivers/clocksource/timer-atmel-st.c | 44 |
1 files changed, 28 insertions, 16 deletions
diff --git a/drivers/clocksource/timer-atmel-st.c b/drivers/clocksource/timer-atmel-st.c index 29d21d68df5a..e9331d36965b 100644 --- a/drivers/clocksource/timer-atmel-st.c +++ b/drivers/clocksource/timer-atmel-st.c @@ -194,15 +194,17 @@ static struct clock_event_device clkevt = { /* * ST (system timer) module supports both clockevents and clocksource. */ -static void __init atmel_st_timer_init(struct device_node *node) +static int __init atmel_st_timer_init(struct device_node *node) { struct clk *sclk; unsigned int sclk_rate, val; int irq, ret; regmap_st = syscon_node_to_regmap(node); - if (IS_ERR(regmap_st)) - panic(pr_fmt("Unable to get regmap\n")); + if (IS_ERR(regmap_st)) { + pr_err("Unable to get regmap\n"); + return PTR_ERR(regmap_st); + } /* Disable all timer interrupts, and clear any pending ones */ regmap_write(regmap_st, AT91_ST_IDR, @@ -211,27 +213,37 @@ static void __init atmel_st_timer_init(struct device_node *node) /* Get the interrupts property */ irq = irq_of_parse_and_map(node, 0); - if (!irq) - panic(pr_fmt("Unable to get IRQ from DT\n")); + if (!irq) { + pr_err("Unable to get IRQ from DT\n"); + return -EINVAL; + } /* Make IRQs happen for the system timer */ ret = request_irq(irq, at91rm9200_timer_interrupt, IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL, "at91_tick", regmap_st); - if (ret) - panic(pr_fmt("Unable to setup IRQ\n")); + if (ret) { + pr_err("Unable to setup IRQ\n"); + return ret; + } sclk = of_clk_get(node, 0); - if (IS_ERR(sclk)) - panic(pr_fmt("Unable to get slow clock\n")); + if (IS_ERR(sclk)) { + pr_err("Unable to get slow clock\n"); + return PTR_ERR(sclk); + } - clk_prepare_enable(sclk); - if (ret) - panic(pr_fmt("Could not enable slow clock\n")); + ret = clk_prepare_enable(sclk); + if (ret) { + pr_err("Could not enable slow clock\n"); + return ret; + } sclk_rate = clk_get_rate(sclk); - if (!sclk_rate) - panic(pr_fmt("Invalid slow clock rate\n")); + if (!sclk_rate) { + pr_err("Invalid slow clock rate\n"); + return -EINVAL; + } timer_latch = (sclk_rate + HZ / 2) / HZ; /* The 32KiHz "Slow Clock" (tick every 30517.58 nanoseconds) is used @@ -246,7 +258,7 @@ static void __init atmel_st_timer_init(struct device_node *node) 2, AT91_ST_ALMV); /* register clocksource */ - clocksource_register_hz(&clk32k, sclk_rate); + return clocksource_register_hz(&clk32k, sclk_rate); } -CLOCKSOURCE_OF_DECLARE(atmel_st_timer, "atmel,at91rm9200-st", +CLOCKSOURCE_OF_DECLARE_RET(atmel_st_timer, "atmel,at91rm9200-st", atmel_st_timer_init); |